Air-valve.



L. IVBRSBN.

` AIR VALVE.

APPLIoA'l-Ion rILnD un 5, 1910.

l 982,680. Patented Jan 24,1911.

WITNESSES l INVENTOII l hk @Tm FQMA UNITED STATES PATENT oEEIoE.

LORENZ IVERSEN, OF WEST AHOIIYIIES'IEAI), PENNSYLVANIA, ASSIGNOR TO MESTA MACHINE COMPANY, 0F PITTSBURG, PENNSYLVANIA, A CORPORATION 0F PENN- SYLVANIA.

AIR-VALVE.

Specication of Letters Patent.

Patented Jan. 24, 1911.

Application led May 5, 1910. Serial No. 559,548.

To all whom it may concern:

Be it known that I, LORENZ IvERsEN, resident of West Homestead, Allegheny county, Pennsylvania, 'have invented a new and useful Improvement in Air-Valves, of .which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming partl of thls specification, in which- I Figure 1 is a view partly in side elevation, and partly in section, of a portionV of an air compressor or blowing engine and illustratin the use of a, valve embodying my invention; and Fig. 2 is an enlarged verl tical section showing the preferred form of my improved valve. y

lMy invention has relation to air valves for blowing engines, or compressors, and is designed ,y to provide a valve having as few parts as" possible and in which the :danger of any part becoming deranged or failing to operate properly is eliminated.

A further object of the invention is, to provide means for cushioning the movements of the valve.

The invention is of particular advantage in connection with a blowing engine or compresser of the ty e described and claimed in theY patent to xeorge Mesta, No. 958,705 dated May 17, 1910, in -which a positively actuated cut-off valve is employed intermediate lthe cylinder and the discharge valve, whereby the discharge valve may Lbe given `a slow closing movement, since the cut-off is effectedy by the positively actuated valve. Fig, 1 of `the accompanying drawing shows my invention applied to a blowing engine or compressor of this type, 3 being the tub or cylinder, 4 one of the heads having a rotary positively actuated cut-oli' valve 5 at each side of the piston center, and 6 being one of my improved air valves of the puppet type, and which is seated between the positively actuated valve 5 andthe discharge 7. The valve 5, together with means for actuating the same is more fully described in the said patent, to which reference may be made.

The discharge valve 6 is of cup form, and is seated within the cage 7 having the lateral dischargeports 8 near ,itsflower end, and which, communicate with the discharge passage or receiver space l7. The" cage 7 is shown as provided with a separate top plate gaged by a, removable screw plug 15, and

the end of the stem has therein a suitable socket 16 which can be engaged by a liftmg device when the plug 15 is removed. By the removal of this plug and ot' the cap plate 14:, theentire cage can be lifted vertically through the opening 17 in the outer end Wall of the cylinder head.

The valve 6 is formed with a lplurality of air holes 18 arranged around its' circumference, and the cage 7 has an internal circumferential groove 19 which communicates with the outside of the cage by the series of holes 20. In the closed position of the valve 6 the holes 18 are a short distance below the lower edge of the groove 19. When the valve starts to open, it first compresses the air within the cage; but after a short vertical movement the first holes 18 of the series of these holes come in line with the groove 20, which permits the partially compressed air within the cage to escape through the perforations Q0, this escape becoming more free as more of the holes are brought into line with this groove. When all of theholes 18 have passed above the upper edge of the groove, the air is again confined within the cage, resulting in a compression. which cushions the valve at the end portion of its upstroke. The spring acts to close the valve, the closing movement beiugcomparatively rapid until the perforations 18 pass the groove 19. No further air can ,then be admitted to the cage from the outside, and a.

partial vacu'um 1s formed-within the cage which retards the final closing movement of the valve and cushionsitsseating. In this manner the pounding of the valve and hammering and cutting thereof, and of the valve seat, 1s prevented. The spring 11 can be made very light, all that is required being that it shall be sufficiently strong to overcome the friction between the valve and ca e. The valve itself can be made very lig t, since it can be made from a single piece of relatively thin. metal, the cylindrical por'-V tion being machined to 4fit accurately within the cage. y f

The advantages of my invention will be apparent to those skilled @n the art, since it provides a valve which isextremely simple in its construction and arrangement; in which there are lno parts to become derangedin operation; whlch can be manufactured at a low cost; and in which hammering of the valve is prevented.

I do not limit myself to the precise construction and arrangement of the arts which I have herein shown and described, since the valve cage may lbe constructed and arranged in various Ways; the exact form of the valve may be changed; and other minor changes may be made without ldeparting from the spirit and scope of my invention as dened in the claims.

What I lclaim is n 1. In a valve of the character described,-a cage having openings inl its lateral walls, and a valve member seated within the cage and having lateral perforations which are arranged to communicate with the openings in the cage at an intermediate point in the stroke of the valve;` substantially as described. I

2. In a valve of the character described, a cage having openings in its lateral walls, a valve member seated withinfthe cage and having lateral perforations which are arranged to communicate with the op'enings in the cage at an intermediate point in the stroke of the valve, said perforations being below the openings of the cage when the valve is closed and above said openiny s when the valve is fully opened;.substant1ally as described.

3. In' a valve of the character described, a cage having openings .in its lateral walls, a

valve member seated within the cage and 'having lateral perforations which are arranged to communicate with the openings in the cage at an intermediate stroke of the valve, together wlth a spring acting to close the valve; substantially as described.

4. In a valve of the character described, a cage having openings in its lateral walls, a va ve member seated within the cage and having lateral perforations which are arranged to communicate with the openings in the cage at an intermediate pointv in the stroke of the valve, the said penforations being located at different points so as to come into register with said openings at dii'erent times; substantially as described.

5. In a valve of the character described, the combination with a cage having an internal circumferential groove with openings leading outwardly therefrom, of a valve member of cup form seated within said cage and having a plurality of staggered fperforations in its lateral walls, said per orations being arranged to come into register with said groove during the intermediate portion only of the valve travel; substantiallyfas described.

6. Ina valve of the character described, a cage having an air opening in its lateral wall, and a valve member seated within the cage and having lateral openings which are arranged to communicate with the opening in the cage at an intermediate point in they stroke of the vvalve; substantially as described.

' In testimony whereof, I have hereunto set my hand.A

point in the 

